# C++ Program to Print Upper Triangle of a Matrix

Write a C++ Program to Print Upper Triangle of a Matrix with an example. The following image shows you the matrix upper triangle.

In this C++ matrix upper triangle example, we used nested for loops to iterate upperTriMatrix matrix rows and columns. Within that, we used C++ If Else statement (if(columns >= rows)) to check whether the column value is greater than or equal to the row value. If True, print the upperTriMatrix matrix item at that position; otherwise, print 0 in that position.

```#include<iostream>
using namespace std;

int main()
{
int i, j, rows, columns;

cout << "\nPlease Enter Matrix rows and Columns to find Upper Triangle =  ";
cin >> i >> j;

int upperTriMatrix[i][j];

cout << "\nPlease Enter the Matrix Items\n";
for(rows = 0; rows < i; rows++)	{
for(columns = 0; columns < i; columns++) {
cin >> upperTriMatrix[rows][columns];
}
}

cout << "\nThe Result of the Upper Triangle Matrix is :\n";
for(rows = 0; rows < i; rows++)
{
cout << "\n";
for(columns = 0; columns < j; columns++)
{
if(columns >= rows)
{
cout << upperTriMatrix[rows][columns] << " ";
}
else
{
cout << "0 ";
}
}
}

return 0;
}```

In this C++ Matrix Upper Triangle example, we used extra cout statements to show the iteration-wise row value, column value, and upperTriMatrix[rows][columns] value.

```#include<iostream>
using namespace std;

int main()
{
int i, j, rows, columns;

cout << "\nPlease Enter Matrix rows and Columns to find Upper Triangle =  ";
cin >> i >> j;

int upperTriMatrix[i][j];

cout << "\nPlease Enter the Matrix Items\n";
for(rows = 0; rows < i; rows++)	{
for(columns = 0; columns < i; columns++) {
cin >> upperTriMatrix[rows][columns];
}
}

cout << "\nThe Result of the Upper Triangle Matrix is :\n";
for(rows = 0; rows < i; rows++)
{
cout << "\n";
cout << "\nRow Iteration = " << rows + 1 << ", Row Number = " << rows;
for(columns = 0; columns < j; columns++)
{
cout << "\nColumn Iteration = " << columns + 1 << ", Column Number = " <<
columns << ", and Row Number = " << rows;
cout << "\nThe result of (columns >= rows) = " << (columns >= rows) <<
" and upperTriMatrix[" << rows << "][" << columns << "] = " << upperTriMatrix[rows][columns] << endl;
if(columns >= rows)
{
cout << upperTriMatrix[rows][columns] << " ";
}
else
{
cout << "0 ";
}
}
}

return 0;
}```
``````Please Enter Matrix rows and Columns to find Upper Triangle =  2 2

10 20
30 40

The Result of the Upper Triangle Matrix is :

Row Iteration = 1, Row Number = 0
Column Iteration = 1, Column Number = 0, and Row Number = 0
The result of (columns >= rows) = 1 and upperTriMatrix[0][0] = 10
10
Column Iteration = 2, Column Number = 1, and Row Number = 0
The result of (columns >= rows) = 1 and upperTriMatrix[0][1] = 20
20

Row Iteration = 2, Row Number = 1
Column Iteration = 1, Column Number = 0, and Row Number = 1
The result of (columns >= rows) = 0 and upperTriMatrix[1][0] = 30
0
Column Iteration = 2, Column Number = 1, and Row Number = 1
The result of (columns >= rows) = 1 and upperTriMatrix[1][1] = 40
40``````

## C++ Program to Print Upper Triangle of a Matrix using a While Loop

```#include<iostream>
using namespace std;

int main()
{
int i, j, rows, columns;

cout << "\nPlease Enter Matrix rows and Columns to find Upper Triangle =  ";
cin >> i >> j;

int upperTriMatrix[i][j];

cout << "\nPlease Enter the Matrix Items\n";
for(rows = 0; rows < i; rows++)	{
for(columns = 0; columns < i; columns++) {
cin >> upperTriMatrix[rows][columns];
}
}

cout << "\nThe Result of the Upper Triangle Matrix is :\n";
rows = 0;
while(rows < i)
{
cout << "\n";
columns = 0;
while(columns < j)
{
if(columns >= rows)
{
cout << upperTriMatrix[rows][columns] << " ";
}
else
{
cout << "0 ";
}
columns++;
}
rows++;
}

return 0;
}```
``````Please Enter Matrix rows and Columns to find Upper Triangle =  3 3